Tint laying machine



Aug.1s,1931. L.J.BROWN v1,319,071

TINT LAYING MACHINE Filed May 20. 1929 Q Q l /4 S 4 /7 "2 O. I 4 55 54' 2 2,12 7. 5 H 5` 8 6 O n 2A @gf @9 lo .nga

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Patented Aug. 18, 1931 UNITED STATES LEONARD J. BROWN, OF TAGOMAyWASI-IINGTHON TINT LAYING MAoirINE Application led May 20,

My invention pertains tov tint laying machines known as the Ben Day tint laying machines, commonly used for layingv tints on metal or paper for the photoengraver and on metal or stone for the lithographer and for other uses where a dot line or other stipple is used.

The object of my invention is to simplify the construction and operation of tint laying machines and to attain more ease and greater accuracy in its use.

Heretofore the tint laying film has been adjusted and controlled by micrometer-s applied in line with the adjustment, aprocess in which there is more or less lost motion and inaccuracy. In my improvement the tint laying film is adjusted and controlled by inclined planes and similar mechanical movements actuated by a single micrometer with perfect ease and accuracy.`

The attainment of these objects will be shown and described by referring to the accompanying drawings, in which Fig. 1 is a top view of my improved tint laying machine inclosed within a fixed frame or case, the top inclosing plate being removed to expose the improved operative mechanism; Fig. 2 is a vertical cross section on line 2-2 looking to the right; Fig. 3 is a front view of Fig. 1, the top plate being in place as it is shown also in Fig. 2; Fig. 4 is a top view of a like machine designed to be operated on pivotally operated levers; and Fig. 5 is a like machine designed to be operated by spiral gears and cams. Similar parts are indicated and referred to by similar characters in each of the several views.

Referring to the drawings, it will be. seen that the single micrometer 1 with a compression spiral spring 2 around its shaft will operate and control the inclined contact planes 33 formed on the ends of the bar 4 which is designed to slide to the right and to the left. The forward and backward movement is attained by means of the bar 5 formed with inclined contact planes to t and bear against the inclined planesB- of bar 4. It will be seen that the compression spring 6-6 supported on the side wall of the frame or case 7, will hold the inclined planes A frame 7.

1929." serial Nol 364,597.

33 in positive and constant contact, and these inclined `surfaces will react on the bar V5, pressing it toward the left so that its end will bear onand be guided by the finished interior surface of the wall 5f of the frame 7 andV also on the rear bar 4, pressing it against the interior wall 4 of the frame 7 and toward the right against the action of the spring 2 as controlled by the micrometer 1. The sliding movement of the bar 4 to the 60 right or to the left, attained by turningl the micrometer 1, will cause a perfectly parallel movement of the bar 5 forward or backward as desired and, though small, the movement will be made with the utmostaccuracy and perfect ease by the use of the single micrometer 1. i

The function of the spring 2, lcompressed between the frame 7 and the bar 4 and encircling the micrometer shaftis used to eliminate any backlash between thethreads of the micrometer screw yand the threads in thebar 4 by Ycausing the said threads'to always bear onthe same side. .j This spring 2 is valways in compression and the micrometer screw shaft isthereby constantly held in tensionand there can therefore, be no lost motion in the machanism.. It will also be observed jthat 'the -complementary inclined" surfaces 3-3 and,4 *4 on the bars 4 and 5 `are each '80 single contact surfaces which are kept in constant contact by the compression springs 6-6L Heretofore a single motion has ,been attained by forming a slot in one member and a lug inthe other riding inthe slot, thus producing a double contact between the parts. A very slight wear in either the slot or in the lugwill cause theV device to act imperfectly, because it will permita slight unintended motion between the, two parts. 9D

This vdefect has been completely eliminated by" my improved machine which has the Vsingle acting contact surfaces as shown and theV springslv 6-6 to keep them in contact. The springs 6 6 also keep the bar 4 tightly 95 pressed against the rear inner surface of the The bars 4 and 5 are neatly milledto, fit and operate within the `inelosing'frame 7 Ywhich is v.likewise milled to receive them. lf3@ The bar 4 is made with small side extension lugs 4-4 to make sliding co-ntact with the bottom and top of the inclosing frame 7 and is thus kept in eXact alinement. Likewise the bar 5 has on its sides milled guide barlike extensions 5 for the same purpose. The inclosing top l2 is shown in Figs. 2 and 3.

Attached to the bar 5 is the usual film holding frame 8-8 in the outer ends of which are inserted the pivotal film holdingVV pointed pins 99. These holdin-g pins are actuated by spiral encircling springs as shown in Fig. 3, and one is equipped with a micrometer l() whereby the film can be finely adjusted to the right or left. The film holding frame and pivotal pins as shown, are common to all tint laying machines and are not new nor novel. vHowever, it is mounted within my improved tint laying machine and is used in combination therewith and will thereby be made to function accurately.

` It will now be seen that when the film for laying on tints is mounted on the pivotal pins 9 9, it will be moved forward or backward with ease and accuracy, free of lost motion or vibration. The bar 4 operated and controlled by the single micrometer l will, by means of the inclined contact planes at 3, move the spring stabilized bar 5 forward or backward with the utmost nicety, and with it the film carrying frame 8-8 fixed thereto.

It is to be observed the bearings on the bar --4 can be made with means for eliminating friction common to bearings of this form.

There are other adjustable means whereby the improved tint laying machine may be operated and controlled by a single micrometer, two of which are shownin Figs. 4 and ing said pairs of inclinec planes in continuous contact, whereby the adjustment of said micrometer causes both ends of said screen carrier to move simultaneously and equally.

3. In a tint laying machine, the combination of a frame,v a screen carrier mounted therein, and adapted to move inward and outward therein, springs interposed between said frame and said screen carrier and adapted to cause said screen carrier to move inward in said frame, a single micrometer mounted in said frame., and means actuated by said micrometerand acting in opposition to said springs whereby said screen carrier may be. moved outward from said frame.

4. In a tint laying machine, the combination of a frame, a screen carrier mounted and guided therein to move inward and outward therein, springs interposed between said frame and said carrier and adapted to cause lsaid carrier to move inward in said frame, a single micrometer mounted in said:

frame, and two sets of means, each simultaneously, correspondingly, and equally actuated by said micrometer in opposition to said springs and engaging the ends of said cai'- rier, whereby both ends of said screen cai-.

rier are equally moved.

LEONARD J. BROWN.

5.. In Fig. 4, the inclined planes 8-3 above described, by two. similar parallel levers I3-1S, pivoted to the base ofthe frame 7 and which are equally operated by the movement of the bar 4 and which engage and op- 'Y eratethe bar 5. In Fig. 5 tliebar 4 has been substituted by the worm gear rod 19 meShing with two worm wheels 20-20 mounted on the basey of the frame 7 to turn therein and each having similar parallel cams 14-14 SG- cured thereto and engaging the bar 5 to operate it.

As to being set levelor adjusted as to v l micrometer and said screen carrier, and springs holding said inclined planes in con-V tinuous Contact, whereby the adjustment of said micrometer causes said carrier to` move. 2. In a tint laying'macliin e the combina` 

